Heating unit



Feb.y 9 1926. 1,572,395

- F. Kul-N E'r AL HEATING UNIT Filed June -15' Y3.918

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l l Il K gwwmwmmww (luana/VS Patented Feb. 9, 1926.

UNITED 'STATES PATENT FFICE.

FRANK KUHN AND JAY A. HAND, OF DETROIT, MICHIGAN, ASSIGNORS TO AMERICAN ELECTRICAL HEATER COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

Application ledJune 15, 1918. Serial No. 240,150.

To all w71 om t may concern:

Be it known that we, FRANK KUHN and JAY A. HAND, citizens of the United States of America, residing at Detroit, in the 'county of Wayne and State of Michigan, have invented certain new and useful Improvements in Heating Units, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to an electric heating unit and its Object is to provide a` heating unit particularlvadapted to be located at the focus of an ellipsoidal or other dished reflector, the construction being such as to interfere as little as possible with the reflected rays of heat.

In the accompanying drawings y Figure 1 is a view of the heating unit in side elevation and sectionally showing are- Hector and socket member with which the unit i's associated;

Figure 2 is a view of the heating unit "seen at right angles to the showing in Fig- 'ure 1;

Figure 3 is a cross-sectional View showing the heating unit associated with the reflector.

Inthese views, the reference character 1 designates an insulatory core which is grad- .ually reduced in diameter from an intermediate point to-its respective extremities, said core being formed with a spiral groove in which is Wound a coiled heating element 2, the convolutions of said heating element being transverse to said groove. Said core is mounted upon abolt 3, the head of which -has electrical connection with one end of 'said heating element adjacent the corresponding end of said core. the bolt being extended slightly beyond the other end of the core to engage a bracket 4. 'Said bracket has an integral base portion 5 to whichv are secured a pair of spaced pins 6 parallel to.A

the bolt 3 and projecting oppositely therefrom. One of said pins is directly connected with said base 5 while the other is insulated from the base by mica washers 6aL and has a metal strip 7 lclamped beneath its head with which strip .the adjacent extremity of the heatingelement is connected. 8 is a socket member with which said pins are detachably rengageable and 9 is a reflector core, a metallic support for preferably of ellipsoidal shape at the focus of which said heating unit is disposed.

Owing to the double taper given to the above described heating unit, the end portions of the heating element do not appreciably interfere with the direct forward or rearward radiation from a center portion of the unit so that; an increased efficiency is secured as compared to cylindrical heating units such as have hitherto been employed. By employing a coiled heating element the number of turns necessary to apply a given length of the element to the core is very much reduced as compared to an uncoiled element. The provision for quick detachability of the unit facilitates assembling and reairs.

at we claim as our invention, is:

1. An electric heating unit comprising an insulating core, a resistor wound upon said e core passing centrally therethrough and 'included in the circuit of said resistor, a bracket upon which said support is mounted, also included in said circuit, and terminal members carried by said bracket one of which has electrical connection therewith while the other is insulated therefrom, and means connecting the last-mentioned terminal with said resistor.

2. A heating unit comprising an insulating core, a metallic supporting bracket for said core, a pair of terminal posts mounted upon said bracket, one thereof having an electrical contact with the bracket, and the tures. l

FRANK KUHN. JAY A. HAND. 

